Create and modify Font Proof documents programmatically (PDF font proofs, live from Glyphs.app).
Create and modify Hellbox documents programmatically. Hellbox (formerly Font Proof) is a macOS app for type designers that generates PDF font proofs and live-reloads them from Glyphs and RoboFont.
This package launches the MCP server that ships inside the Hellbox app bundle. The server lets AI tools create and edit .fontproof documents directly; the app does not need to be running.
npx)The easiest path is Hellbox's built-in one-click setup: open Hellbox, go to Preferences, then AI Integration, and click the installer for your client. To set it up manually instead:
claude mcp add font-proof -- npx -y font-proof-mcp
Add to ~/Library/Application Support/Claude/claude_desktop_config.json:
{
"mcpServers": {
"font-proof": {
"command": "npx",
"args": ["-y", "font-proof-mcp"]
}
}
}
Add the same command / args pair to ~/.cursor/mcp.json.
If Hellbox is installed somewhere other than /Applications or ~/Applications, set FONT_PROOF_MCP_PATH to the full path of Hellbox.app/Contents/Helpers/font-proof-mcp.
create_proof, create_complete_proof, open_proof, get_proof_info, open_in_appadd_section, update_section, delete_section, reorder_sections, duplicate_section, set_section_content_bulk, update_section_settingsadd_fonts, remove_fonts, list_system_fonts (variable font axes supported)list_glyphs_fonts, add_glyphs_fontsFull documentation: hellbox.com/docs under "MCP Server".
The MCP server is a Swift binary embedded in the Hellbox app at Contents/Helpers/font-proof-mcp, codesigned with the app and always in sync with the app's document format. This package is a thin launcher: it finds that binary and hands over stdio. No server logic is duplicated here, so the tools you get always match the app version you have installed.
The package keeps the font-proof-mcp name from the app's Font Proof era; the npm name, the server name MCP clients see, and the .fontproof file extension are all stable across the rename.
Hellbox is made by Minim Industries.
Source-derived launch command. Check the maintainer’s required arguments and credentials before running:
npx -y font-proof-mcpMerge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.
{
"mcpServers": {
"io-github-jakefleming-font-proof-mcp": {
"command": "npx",
"args": [
"-y",
"font-proof-mcp"
]
}
}
}Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.
Claude Desktop setup referencefont-proof-mcpnpmio.github.jakefleming/font-proof-mcp works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.
~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.~/.cursor/mcp.jsonRestart Cursor for changes to take effect..vscode/mcp.jsonReload VS Code window for changes to take effect.~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect..mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.